Loop and modify xml nodes SQL Server - sql

Question

I want to loop through xml nodes in SQL Server, and create a copy of each node containing ','.
For example, for the following xml :
declare #answerXML xml = '<answers><answer part="1">answer,test0</answer><answer part="1">answer,test1</answer></answers>'
I want to be modified to become the following :
declare #answerXML xml = '<answers><answer part="1">answer,test0</answer><answer part="1">answer, test0</answer><answer part="1">answer,test1</answer><answer part="1">answer, test1</answer></answers>'
(Each node is duplicated, and in the added node, a space is added after the comma).
I was planing in using something like this :
SELECT
T.ref.value('.', 'varchar(256)') AS Answer
FROM
(SELECT
[Xml] = #answerXML.query('for $i in data(/answers/answer)
return element temp { $i }')
) A
CROSS APPLY
A.Xml.nodes('/temp') T(ref)
But no use, it seems it's too complicated.
Can anyone help in how to loop and update XML in T-SQL?
Thank you in advance,

Answer 1

You can try to shred the XML and rebuild it from scratch:
declare #answerXML xml=
'<answers>
<answer part="1">answer,test0</answer>
<answer part="1">answer,test1</answer>
</answers>';
SELECT a.value(N'#part',N'int') AS [answer/#part]
,a.value(N'text()[1]',N'nvarchar(max)') AS [answer]
,''
,a.value(N'#part',N'int') AS [answer/#part]
,REPLACE(a.value(N'text()[1]',N'nvarchar(max)'),',',', ') AS [answer]
FROM #answerXML.nodes(N'/answers/answer') AS A(a)
FOR XML PATH(''),ROOT('answers')
The result
<answers>
<answer part="1">answer,test0</answer>
<answer part="1">answer, test0</answer>
<answer part="1">answer,test1</answer>
<answer part="1">answer, test1</answer>
</answers>